CN1662966A - Method and device for recording data on optical recording medium, and optical recording medium - Google Patents

Method and device for recording data on optical recording medium, and optical recording medium Download PDF

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Publication number
CN1662966A
CN1662966A CN038141574A CN03814157A CN1662966A CN 1662966 A CN1662966 A CN 1662966A CN 038141574 A CN038141574 A CN 038141574A CN 03814157 A CN03814157 A CN 03814157A CN 1662966 A CN1662966 A CN 1662966A
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optical recording
power
level
data
recording layer
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加藤达也
平田秀树
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TDK Corp
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TDK Corp
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/0045—Recording
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/0045—Recording
    • G11B7/00456—Recording strategies, e.g. pulse sequences
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
    • G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
    • G11B7/1263—Power control during transducing, e.g. by monitoring
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/2403—Layers; Shape, structure or physical properties thereof
    • G11B7/24035—Recording layers
    • G11B7/24038—Multiple laminated recording layers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
    • G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
    • G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
    • G11B7/2433—Metals or elements of Groups 13, 14, 15 or 16 of the Periodic Table, e.g. B, Si, Ge, As, Sb, Bi, Se or Te
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
    • G11B2007/0009—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage
    • G11B2007/0013—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage for carriers having multiple discrete layers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
    • G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
    • G11B2007/24302—Metals or metalloids
    • G11B2007/24304—Metals or metalloids group 2 or 12 elements (e.g. Be, Ca, Mg, Zn, Cd)
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
    • G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
    • G11B2007/24302—Metals or metalloids
    • G11B2007/24312—Metals or metalloids group 14 elements (e.g. Si, Ge, Sn)
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Optical Head (AREA)

Abstract

It is an object of the present invention to provide a method for recording data in an optical recording medium which can form a recording mark having desired length and width in a write-once type optical recording medium. The method for recording data in an optical recording medium according to the present invention is constituted so as to project a laser beam whose power is modulated by a pulse train pattern onto an optical recording medium including a substrate, a first recording layer, a second recording layer and a light transmission layer 16 wherein a recording pulse of the pulse train pattern is divided into (n-1) divided pulses and the power of the laser beam is set to a recording power Pw at the peak of each of the divided pulses, set to a second bottom power Pb 2 at a portion immediately after a last divided pulse and set to a first bottom power Pb 1 at other intervals where Pb 1 is higher than Pb 2.

Description

Be used at optical recording media method for recording data and device, and optical recording media
Technical field
The present invention relates to be used in the optical recording media method for recording data, be used for device at the optical recording media record data, and optical recording media, and more particularly, relate to and being used in the Write-once-type recording medium method for recording data, be used for device at the write once optical recording medium record data, and write once optical recording medium.
Background technology
Optical recording media is widely used as the recording medium that is used to write down numerical data such as CD, DVD or the like.These optical recording medias can be divided into the optical recording media that does not allow to write with overwriting data roughly, such as CD-ROM and DVD-ROM (ROM type optical recording media), allow to write but do not allow the optical recording media of overwriting data, such as CD-R and DVD-R (write once optical recording medium), and the optical recording media that allows overwriting data, such as CD-RW and DVD-RW (but data rewriting type optical recording media).
As known in the art, usually in its manufacture process, the pre-pit that use forms in substrate (pre-pit), data are recorded in the ROM type optical recording media, but and in data rewriting type optical recording media, usually phase-change material is changed as the material of recording layer and the light characteristic that utilizes the phase transformation by phase-change material to cause and come record data.
On the other hand, in write once optical recording medium, usually with organic dyestuff,, and utilize to change and come record data as the material of recording layer such as cyanine dye, phthalocyanine dye or azo dyes by the chemistry of the chemical change of organic dyestuff or organic color and light characteristic that physical change causes.
In addition, known a kind of Write-once-type recording medium (for example seeing Japanese Patent Application Publication No.62-204442) that forms by two recording layers of lamination, in this optical recording media, be contained in two units in the recording layer by projecting laser bundle and hybrid packet thereon and usually form the zone that light characteristic is different from the optical characteristics of near zone, thus record data therein.
In this manual, comprise at optical recording media under the situation of the recording layer that includes organic dye, the zone of organic dyestuff chemical change or chemistry and physical change is called " record mark " with laser beam irradiation the time, and comprising that at optical recording media two recording layers and each comprise under the situation of inorganic elements as principal ingredient, the zone that hybrid packet is contained in two recording layers as the inorganic elements of principal ingredient with laser beam irradiation the time is called " record mark ".
The best approach that is used to modulate the power that is incident upon the laser beam on the optical recording media that is used for record data therein is commonly referred to " pulse string mode " or " Write strategy ".
Figure 10 is that expression is used for the typical pulse string pattern at the CD-R record data that comprise the recording layer that includes organic dye, and expression is used for the figure with the pulse string mode of EFM modulation code record 3T to 11T signal.
As shown in figure 10, under the situation of record data, common employing has the recording impulse (for example referring to Japanese Patent Application Publication No.2000-187842) corresponding to the width of the length of the record mark M that will form in CD-R.
More particularly, when laser beam projects on the clear area that does not form record mark M, make the power of laser beam be fixed to lowest power (bottom power) Pb, and project when forming record mark M regional when laser beam, its power is fixed to recording power Pw.Therefore,, make the organic dyestuff that is included in the recording layer decompose or split and fall in the location that forms record mark M, and should the zone physical deformation, thereby record mark M formed therein.Wherein, press the 1X line writing speed of CD-R, the shortest interval, clear area (3T) is about 700nsec with the ratio (the shortest clear area interval/line writing speed) of line writing speed.
Figure 11 is that expression is used for the typical pulse string pattern at the DVD-R record data that comprise the recording layer that includes organic dye, and expression is used for the figure with the pulse string mode of 8/16 modulation code record 7T signal.
Because with than the higher line writing speed record data in DVD-R that use when the record data in CD-R, different with the situation of record data in CD-R, use has the recording impulse corresponding to the width of the length of the record mark M that will form, is difficult to form the record mark with excellent in shape.
Therefore, use train of impulses record data in DVD-R, wherein, as shown in figure 11, recording impulse is divided into sub-divided pulses (divided pulse) corresponding to the quantity of the length of the record mark M that will form.
More particularly, under situation with 8/16 modulation code record nT signal, wherein, n is equal to or greater than 3 and the integer that is equal to or less than 11 or 14, adopt (n-2) individual sub-divided pulses, and at the peak value place of each sub-divided pulses, the power setting of laser beam is become recording power Pw, and, it is arranged to lowest power Pb in other parts of pulse.In this manual, the pulse string mode that constitutes thus is called " basic pulse string pattern ".Wherein, press the 1X writing speed of DVD-R, the shortest interval, clear area (3T) is about 115nsec with the ratio (the shortest clear area interval/line writing speed) of line writing speed.
Yet, in by the research that the present inventor did, discovery is along with the ratio (the shortest clear area interval/line writing speed) of interval, the shortest clear area with the line writing speed reduces, when adopting the basic pulse string pattern to be used to form short record mark M, direction of motion with respect to laser beam, tend to the moving direction skew towards laser beam in the record mark marginal portion of record mark M downstream end, the become shake of the signal being longer than Len req and being reproduced of record mark M becomes more abominable thus.
Discovery the shortest clear area at interval the ratio (the shortest clear area interval/line writing speed) of (3T) and line writing speed be equal to or less than under the situation of 40nsec and the ratio (the shortest clear area interval/line writing speed) of the shortest interval, clear area (3T) and line writing speed further less than with the situation that is equal to or less than 20nsec under, this phenomenon becomes more remarkable, direction of motion with respect to laser beam, record mark marginal portion on small records mark M upstream extremity (being called " leading edge portion of record mark M " hereinafter) is also tended to the direction skew opposite with the direction of motion of laser beam, and the record mark M shake of being longer than Len req and reproducing signal that becomes also becomes more abominable thus.
Can reasonably suppose, even the rear edge part of record mark is because in the location with respect to the rear edge part downstream of the record mark of the direction of motion of laser beam to the reason of the direction of motion of laser beam skew, by by have projection thereon, be used to form the heat that laser beam generated of the recording power Pw of record mark, make recording layer physics and/or chemically change.On the other hand, the leading edge portion that can suppose record mark is because disturb the temperature that makes to increase by the heat between the adjacent record mark to the reason of the direction skew opposite with the moving direction of laser beam, and the temperature in the zone of the laser beam irradiation by having the recording power Pw that projects on it, is used to form record mark becomes too high thus.
Become in the length of record mark and to be longer than under the situation of predetermined length,, be necessary to prevent that record mark from becoming is longer than predetermined length because the shake of reproducing signal significantly becomes more abominable.
Can consider by reducing the recording power Pw of laser beam, thereby minimizing is applied to heat on the recording layer when forming record mark, prevents from thus that record mark from becoming to be longer than predetermined length.
Yet under the situation of the recording power Pw that reduces laser beam, therefore the width of record mark and the C/N of signal reduce than (carrier wave/noise ratio).
Another solution that can consider is to shorten the time cycle that the power setting of laser beam is become recording power Pw, i.e. the width of pulse is so that reduce the total amount of heat that is applied on the recording layer when forming record mark.Yet because the modulation rate of laser beam power is restricted, under the extra high situation of online record speed, the pulse width of laser beam can not be arranged to required width sometimes.
Therefore, find under the situation that adopts the basic pulse string pattern, along with the shortest clear area at interval with the ratio (ratio of the shortest clear area interval/line writing speed) of line writing speed when reducing, more be difficult to obtain to have the signal of good signal characteristic.
By with laser beam projection thereon so that generate heat, and be contained in the write once optical recording medium of the element in a plurality of recording layers by this hot hybrid packet, the problems referred to above are remarkable especially.
On the other hand, in recent years, next the die optical recording media that has proposed improved recording density is provided He had extremely high data transmission rate.
In this next die optical recording media, recording capacity that realize to increase and the requirement of extremely high message transmission rate are used for writing down and the diameter that reproduces the laser beam of data is reduced to very little.
For reducing the laser beam spot diameter, be necessary that the numerical aperture that will be used for the object lens of aggregation laser bundle is increased to 0.7 or bigger, for example arrive about 0.85, and with the wavelength decreases of laser beam to 450nm or littler, for example arrive about 400nm.
In addition, owing in next die optical recording media,, require to increase the recording power Pw of laser beam with extremely high line writing speed record data.Yet, owing to have the semi-conductor laser equipment costliness of high output, and the serviceable life of semi-conductor laser equipment with the recording power Pw of laser beam be provided with higher reducing, so preferably use the alap laser beam of its recording power Pw to come record data.
For using the alap laser beam of its recording power Pw that data are recorded in next die optical recording media, it is very effective so that increase the heating of recording layer by the laser beam with recording power Pw that the lowest power Pb of laser beam is set to height.
Yet if the lowest power Pb of laser beam is arranged to height, the skew of the leading edge portion of record mark and rear edge part is bigger, even and in the clear area also physics and/or chemically change recording layer sometimes, thus can not be therein with data recording.
Summary of the invention
Therefore, an object of the present invention is to provide a kind of method that is used for data are recorded in optical recording media, it can form the record mark with Len req and width in write once optical recording medium.
Another object of the present invention provides a kind of method that is used for data are recorded in optical recording media, even this method the shortest clear area at interval with the little situation of the ratio of line writing speed under, also can in write once optical recording medium, form record mark with Len req and width.
Another object of the present invention provides a kind of method that is used for data are recorded in optical recording media, and this method can use its recording power to be arranged to low laser beam, forms to have the record mark of Len req and width in write once optical recording medium.
Another object of the present invention provides a kind of method that is used for data are recorded in optical recording media, and this method can form in comprising the write once optical recording medium of two or more recording layers has the record mark of Len req and width.
Another object of the present invention provides a kind of device that is used for data are recorded in optical recording media, and this method can form the record mark with Len req and width in write once optical recording medium.
Another object of the present invention provides a kind of device that is used for data are recorded in optical recording media, even this method the shortest clear area at interval with the little situation of the ratio of line writing speed under, also can in write once optical recording medium, form record mark with Len req and width.
Another object of the present invention provides a kind of device that is used for data are recorded in optical recording media, and it can use its recording power to be arranged to low laser beam and form the record mark with Len req and width in write once optical recording medium.
Another object of the present invention provides a kind of device that is used for data are recorded in optical recording media, and it can form in comprising the write once optical recording medium of two or more recording layers has the record mark of Len req and width.
Another object of the present invention provides a kind of write once optical recording medium, can form the record mark with Len req and width therein.
Another object of the present invention provides a kind of write once optical recording medium, wherein, even the shortest clear area at interval with the little situation of the ratio of line writing speed under, also can form record mark with Len req and width.
Another object of the present invention provides a kind of write once optical recording medium, wherein, can use its power to be set to low laser beam formation and have the record mark of described length and width.
Another object of the present invention provides a kind of write once optical recording medium that comprises two or more recording layers, can form the record mark with Len req and width therein.
The present inventor is engaged in the research that is used to realize above-mentioned purpose hardy, the result, find when by projection by comprising that at least its level is arranged to be arranged to the laser beam of modulating its power corresponding to the pulse string mode of the pulse of the level of first lowest power corresponding to the pulse of the level of recording power and its level, when in optical recording media, forming record mark, if by being arranged at its level corresponding to comprising further at least one of the front and back end of the pulse of the level of recording power that its level is arranged to the power corresponding to the pulse string mode modulating lasering beam of the pulse of the level of second lowest power that is lower than first lowest power, can form record mark, prevent that signal jitter from becoming more abominable and reducing its C/N ratio with Len req and width.
Therefore, can realize above-mentioned purpose of the present invention by a kind of method that is used for data are recorded in optical recording media, wherein, in the write once optical recording medium of at least one recording layer that on comprising substrate and substrate, forms, come record data by being incident upon at least one recording layer according to the laser beam that pulse string mode is modulated its power and at least one recording layer, forming at least two record marks, this pulse string mode comprises that at least its level is arranged to be arranged to pulse corresponding to the level of first lowest power corresponding to the pulse of the level of recording power and its level, and this is used for the method that data are recorded in optical recording media is comprised by being arranged at its level corresponding to comprising further at least one of the front and back end of the pulse of the level of recording power that its level is arranged to the step that the pulse string mode corresponding to the pulse of the level of second lowest power that is lower than first lowest power comes the power of modulating lasering beam.
In this manual, comprise at optical recording media under the situation of the recording layer that includes organic dye, the zone of organic dyestuff chemical change or chemistry and physical change is called " record mark " with laser beam irradiation the time, and comprise two recording layers at optical recording media and each layer comprise inorganic elements as the principal ingredient situation under, the zone that is included in laser beam irradiation the time in two recording layers as the inorganic elements mixing of principal ingredient is called " record mark ".
According to the present invention, because by being arranged at its level corresponding to comprising further at least one of the front and back end of the pulse of the level of recording power that its level is arranged to come corresponding to the pulse string mode of the pulse of the level of second lowest power that is lower than first lowest power power of modulating lasering beam, so comprise that at pulse string mode its level is arranged to can cool off the leading edge portion of disturbing each record mark that heats owing to the heat of adjacent record mark effectively under the situation corresponding to the pulse of the level of second lowest power that is lower than first lowest power on its level is arranged to front end corresponding to the pulse of the level of recording power.Therefore, owing to can prevent with respect to the regional chemistry or the chemistry of the recording layer of the leading edge portion upstream of the record mark of the direction of motion of laser beam and physically change, so can prevent effectively that the leading edge portion of record mark is offset and signal jitter becomes more abominable.
In addition, according to the present invention, be arranged to rear end part corresponding to the pulse of the level of recording power at pulse string mode at its level and comprise that further its level is arranged under the situation corresponding to the pulse of the level of second lowest power that is lower than first lowest power, can cool off rear edge part effectively by the record mark of laser beam heats, and owing to can prevent with respect to the regional chemistry or the chemistry of the recording layer in the rear edge part downstream of the record mark of the direction of motion of laser beam effectively and physically change, so can prevent effectively that the rear edge part of record mark is offset and signal jitter becomes more abominable.
In addition, according to the present invention, be arranged to front and back end part corresponding to the pulse of the level of recording power at pulse string mode at its level and comprise further that all its level is arranged to can prevent effectively that the front and rear edge skew and the signal jitter of record mark from becoming more abominable under the situation corresponding to the pulse of the level of second lowest power that is lower than first lowest power.
In addition, in by the research that the present inventor did, discovery is being arranged to corresponding to comprising further at least one of the front and back end of the pulse of the level of recording power that its level is arranged to come the power of modulating lasering beam so that under the situation of record data corresponding to the pulse string mode of the pulse of the level of second lowest power that is lower than first lowest power by using at its level, even when using its first lowest power to be arranged to height and recording power to be arranged to low laser beam record data, the C/N that also can prevent stop signal effectively is than reduction.
In preferred aspects of the invention, optical recording media further comprises light-transmitting layer and first recording layer that forms and second recording layer between substrate and light-transmitting layer, thereby this optical recording media constitutes by laser beam being projected make on it to be included in first recording layer as the element of principal ingredient and to be included in second recording layer element as principal ingredient and mixes and form at least two record marks.
In preferred aspects of the invention, second recording layer forms with first recording layer and contacts.
In preferred aspects of the invention, being arranged to be equal to or less than 40nsec with the ratio of line writing speed forms at least two record marks at interval in the clear area by will be the shortest.
In preferred aspects of the invention, being arranged to be equal to or less than 20nsec with the ratio of line writing speed forms at least two record marks at interval in the clear area by will be the shortest.
In preferred aspects of the invention, constitute its level by sub-divided pulses and be arranged to pulse corresponding to the level of recording level corresponding to the quantity of the length of record mark.
In preferred aspects of the invention, the power setting of laser beam is become first lowest power between the adjacent sub-divided pulses.
In preferred aspects of the invention, has the laser beam that equals or be shorter than the wavelength of 450nm, record data in optical recording media by projection thereon.
In preferred aspects of the invention, satisfy object lens and the laser beam of λ/NA≤640nm by adopting numerical aperture NA and wavelength X, and laser beam is incident upon on the optical recording media, thereby data are recorded in the optical recording media through object lens.
Can also realize above-mentioned purpose of the present invention at the device of optical recording media record data by a kind of being used for, this device comprises the laser beam grenade instrumentation, be used for to be incident upon the write once optical recording medium of at least one recording layer that comprises substrate and on substrate, form according to the laser beam that pulse string mode is modulated its power, this pulse string mode comprises that at least its level is arranged to be arranged to pulse corresponding to the level of first lowest power corresponding to the pulse of the level of recording power and its level, and this laser beam grenade instrumentation is configured to by means of being arranged at its level corresponding to comprising further at least one of the front and back end of the pulse of the level of recording power that its level is arranged to come corresponding to the pulse string mode of the pulse of the level of second lowest power that is lower than first lowest power power of modulating lasering beam.
Can also realize above-mentioned purpose of the present invention by a kind of write once optical recording medium, this optical recording media comprises substrate and at least one recording layer that forms on substrate, this optical recording media be configured to by will modulating its power according to pulse string mode laser beam projection thereon and at least one recording layer, form at least two record marks and come record data therein, this pulse string mode comprises that at least its level is arranged to be arranged to pulse corresponding to the level of first lowest power corresponding to the pulse of the level of recording power and its level, this optical recording medium is useful on the data be used for according to the required record condition of the power of pulse string mode modulating lasering beam is set, and this pulse string mode is arranged to corresponding to comprising further at least one of the front and back end of the pulse of the level of recording power that its level is arranged to the pulse corresponding to the level of second lowest power that is lower than first lowest power at its level.
According to the present invention, because optical recording medium is useful on the data that are used for according to the required record condition of the power of pulse string mode modulating lasering beam are set, this pulse string mode is arranged to corresponding to comprising further at least one of the front and back end of the pulse of the level of recording power that its level is arranged to the pulse corresponding to the level of second lowest power that is lower than first lowest power at its level, so when when being recorded in data in the optical recording media laser beam projection thereon, the power of energy modulating lasering beam has the record mark of Len req and width so that form, therefore, can prevent that signal jitter from becoming more abominable and preventing C/N than reducing.
In preferred aspects of the invention, optical recording media further comprises light-transmitting layer, and first recording layer that forms between substrate and light-transmitting layer and second recording layer, thereby this optical recording media constitutes by laser beam being projected make on it to be included in first recording layer as the element of principal ingredient and to be included in second recording layer element as principal ingredient and mixes and form at least two record marks.
In preferred aspects of the invention, second recording layer forms with first recording layer and contacts.
In the present invention, best first recording layer comprises different elements as principal ingredient with second recording layer, and concerning in them each, a kind of element that will select from the group of being made up of Al, Si, Ge, C, Sn, Au, Zn, Cu, B, Mg, Ti, Mn, Fe, Ga, Zr, Ag and Pt comprises as principal ingredient.
Of the present invention preferred aspect, a kind of element that first recording layer will be selected from the group of being made up of Si, Ge, Sn, Mg, In, Zn, Bi and Al comprises as principal ingredient, and second recording layer is included as essential element with Cu.
In the present invention, being included as principal ingredient and second recording layer at a kind of element that first recording layer will be selected from the group of being made up of Si, Ge, Sn, Mg, In, Zn, Bi and Al comprises Cu under the situation as essential element, except that first recording layer and second recording layer, optical recording media can comprise that a kind of element that will select comprises the one or more recording layers as principal ingredient from the group of being made up of Si, Ge, Sn, Mg, In, Zn, Bi and Al, or Cu is comprised one or more recording layers as essential element.
In the present invention, a kind of element that will select from the group of being made up of Ge, Si, Mg, Al and Sn of best first recording layer comprises as principal ingredient.
In the present invention, comprise under the situation about as principal ingredient and second recording layer Cu being comprised at a kind of element that first recording layer will be selected from the group of being made up of Si, Ge, Sn, Mg, In, Zn, Bi and Al as essential element, preferably at least a element that will select from the group that Al, Si, Zn, Mg, Au, Sn, Ge, Ag, P, Cr, Fe and Ti form is added to second recording layer, and is more preferably at least a element of selecting is added to second recording layer from the group of being made up of Al, Zn, Sn and Au.
Of the present invention another preferred aspect in, first recording layer comprises a kind of element of selecting and comprises as principal ingredient from the group of being made of Si, Ge, C, Sn, Zn and Cu, second recording layer comprises Al as principal ingredient.
In the present invention, being included as principal ingredient and second recording layer at a kind of element that first recording layer will be selected from the group of being made up of Si, Ge, C, Sn, Zn and Cu comprises Al under the situation as principal ingredient, except that first recording layer and second recording layer, optical recording media can comprise that comprising a kind of element of selecting from the group of being made up of Si, Ge, C, Sn, Zn and Cu comprises as one or more recording layers of principal ingredient or Al is included as one or more recording layers of principal ingredient.
In the present invention, comprise a kind of element of selecting at first recording layer from the group of being made up of Si, Ge, C, Sn, Zn and Cu and as principal ingredient and second recording layer Al is comprised under the situation as principal ingredient, preferably at least a element that will select from the group of being made up of Mg, Au, Ti and Cu is added to second recording layer.
In the present invention, comprising a kind of element of selecting at first recording layer from the group of being made up of Si, Ge, C, Sn, Zn and Cu comprises under the situation about as principal ingredient and second recording layer Al being comprised as principal ingredient, first recording layer and second recording layer be preferably formed as for its gross thickness be 2nm to 40nm, be preferably 2nm to 30nm, preferable is 2nm to 20nm.
Of the present invention another preferred aspect in, a kind of element that first recording layer will be selected from the group of being made up of Si, Ge, C and Al comprises as principal ingredient, second recording layer comprises Zn as principal ingredient, and first recording layer and second recording layer form its gross thickness and equal or be thinner than 30nm.
In the present invention, a kind of element that to select from the group of being made up of Si, Ge, C and Al at first recording layer comprises as principal ingredient, second recording layer comprises Zn under the situation as principal ingredient, and optical recording media can comprise that a kind of element that will select is included as one or more recording layers of principal ingredient or Zn is included as one or more recording layers of principal ingredient from the group of being made up of Si, Ge, C and Al.
In the present invention, a kind of element that to select from the group of being made up of Si, Ge, C and Al at first recording layer comprises as principal ingredient, second recording layer is included as Zn under the situation of principal ingredient, and a kind of element that best first recording layer will be selected from the group of being made up of Si, Ge and C comprises as principal ingredient.
In the present invention, a kind of element that to select from the group of being made up of Si, Ge, C and Al at first recording layer is included as principal ingredient, second recording layer comprises Zn under the situation as principal ingredient, first recording layer and second recording layer be preferably formed as for its gross thickness be 2nm to 30nm, be preferably 2nm to 24nm, preferable is 2nm to 12nm.
In the present invention, a kind of element that to select from the group of being made up of Si, Ge, C and Al at first recording layer comprises as principal ingredient, second recording layer comprises Zn under the situation as principal ingredient, and preferably at least a element that will select from the group of being made up of Mg, Cu and Al is added to second recording layer.
In preferred aspects of the invention, light-transmitting layer forms the thickness with 10nm to 300nm.
From following description with reference to the accompanying drawings, above-mentioned and other purposes of the present invention and feature will become apparent.
Description of drawings
Fig. 1 is a schematic section of representing the structure of optical recording media according to a preferred embodiment of the present invention.
Fig. 2 (a) is the signal amplification sectional view of optical recording media shown in Figure 1, and Fig. 2 (b) is the signal amplification sectional view that is illustrated in the optical recording media behind the record data wherein.
Fig. 3 is the set of diagrams that is illustrated in first pulse string mode under the situation that adopts the 1.7RLL modulation code, the pulse string mode of wherein Fig. 3 (a) expression pulse string mode when record 2T signal, and Fig. 3 (b) expression when writing down 3T signal to the 8T signal.
Fig. 4 is the set of diagrams that is illustrated in second pulse string mode under the situation that adopts the 1.7RLL modulation code, the pulse string mode of wherein Fig. 4 (a) expression pulse string mode when record 2T signal, and Fig. 4 (b) expression when writing down 3T signal to the 8T signal.
Fig. 5 is the set of diagrams that is illustrated in the 3rd pulse string mode under the situation that adopts the 1.7RLL modulation code, the pulse string mode of wherein Fig. 5 (a) expression pulse string mode when record 2T signal, and Fig. 5 (b) expression when writing down 3T signal to the 8T signal.
Fig. 6 is the data recording of expression a preferred embodiment of the present invention and the block diagram of transcriber.
Fig. 7 is illustrated in the laser beam of using the optimal recording power Pw with the recording power Pw that is confirmed as shaking hour, under the situation with the data transmission rate record data of about 35Mpbs, the C/N of 2T signal compare and the first lowest power Pb1 between the figure of relation.
Fig. 8 is illustrated in the laser beam of using the optimal recording power Pw with the recording power Pw that is confirmed as shaking hour, under the situation with the data transmission rate record data of about 70Mpbs, the C/N of 2T signal compare and the first lowest power Pb1 between the figure of relation.
Fig. 9 is illustrated in to use to have the laser beam of optimal recording power Pw, under the situation with the data transmission rate record data of about 70Mbps, the optimal recording power of the laser beam of the recording power Pw that is confirmed as shaking hour and the figure of the relation between the first lowest power Pb1.
Figure 10 is the figure that expression is used for data are recorded in the typical pulse string mode of the CD-R that comprises the recording layer that includes organic dye.
Figure 11 is the figure that expression is used for data are recorded in the typical pulse string mode (basic pulse string pattern) of the DVD-R that comprises the recording layer that includes organic dye.
Embodiment
Now, the preferred embodiments of the present invention will be described with reference to the drawings.
Fig. 1 is a schematic section of representing the structure of optical recording media according to a preferred embodiment of the present invention.
As shown in Figure 1, optical recording media 10 according to this embodiment is configured to write once optical recording medium, and it comprises substrate 11, in the reflection horizon 12 that forms on the surface of substrate 11, at second dielectric layer 13 that forms on the surface in reflection horizon 12, at second recording layer 32 that forms on the surface of second dielectric layer 13, at first recording layer 31 that forms on the surface of second recording layer 32, at first dielectric layer 15 that forms on the surface of first recording layer 31 and the light-transmitting layer 16 that forms on the surface of first dielectric layer 15.
As shown in Figure 1, form center pit in the central part office of optical recording media 10.
In this embodiment, as shown in Figure 1, laser beam L10 projects on the surface of light-transmitting layer 16, thereby data are recorded in the optical recording media 10 or reproduce data from optical recording media 10.
Substrate 11 usefulness act on the support of the physical strength of guaranteeing that optical recording media 10 is required.
The material that is used for forming substrate 11 is not limited to substrate 11 especially can be as in the support ground scope of optical recording media 10.Substrate 11 can be formed by glass, pottery, resin or the like.In these, preferably resin is used to form substrate 11, because resin is shaped easily.The illustrative example that is suitable for forming the resin of substrate 40 comprises polycarbonate resin, acrylic resin, epoxy resin, polystyrene resin, polyvinyl resin, acrylic resin, silicones, fluoropolymer, acrylonitrile butadiene styrene resin, polyurethane resin or the like.In these materials, from be easy to handle, the viewpoint of light characteristic or the like, polycarbonate resin is suitable for being used to form substrate 11 most.
In this embodiment, substrate 11 has the thickness of about 1.1mm.
Do not limit the shape of substrate 11 especially, but be generally plate-like, card shape or sheet.
As shown in Figure 1, groove 11a and protruding 11b alternately are formed on the surface of substrate 11.Maybe when reproducing data, groove 11a and/or protruding 11b are with the guide rail that acts on laser beam L10 when record data.
Reflection horizon 12 is used for reflecting the laser beam L10 that enters by light-transmitting layer 16 so that send it from light-transmitting layer 16.
Do not limit the thickness in reflection horizon 12 especially, but, be more preferably from 20nm to 200nm preferably from 10nm to 300nm.
The material that is used for forming reflection horizon 12 be not defined in especially can reflection lasering beam scope, reflection horizon 12 can be formed by Mg, Al, Ti, Cr, Fe, Co, Ni, Cu, Zn, Ge, Ag, Pt, Au or the like.In these materials,, such as Al, Au, Ag, Cu or comprise at least a alloy of these metals, form such as the alloy of Al and Ti preferably by metal material with high reflectance.
When cremasteric reflex layer 12 is used for reproducing optically data from first recording layer 31 and second recording layer 32 with convenient laser beam L10, increase recording areas and the reflection coefficient between recording areas is not poor by many disturbing effects (multipleinterference effect), thereby obtain higher reproducing signal (C/N than).
First dielectric layer 15 and second dielectric layer 13 are used for protecting first recording layer 31 and second recording layer 32.By first dielectric layer 15 and second dielectric layer 13, can in the long time cycle, prevent the optical recording data degradation.In addition, the hot distortion because second dielectric layer 13 also is used for preventing substrate 11 or the like becomes more abominable so can prevent to shake or the like distortion owing to substrate 11 or the like effectively.
The dielectric material that is used for forming first dielectric layer 15 and second dielectric layer 13 is not defined in transparent scope especially, and first dielectric layer 15 and second dielectric layer can be formed by the dielectric material that comprises oxide, sulfide, nitride or its combination (for example as principal ingredient).More particularly, for preventing substrate 11 or the like owing to heat is out of shape, thereby protect first recording layer 31 and second recording layer 32, best first dielectric layer 15 and second dielectric layer 13 will be from by Al 2O 3, AlN, ZnO, ZnS, GeN, GeCrN, CeO, SiO, SiO 2, at least a dielectric material selected in the group formed of SiN and SiC comprises as principal ingredient, and best first dielectric layer 15 and second dielectric layer 13 are with ZnSSiO 2Comprise as principal ingredient.
First dielectric layer 15 can be formed by identical dielectric material or different dielectric material with second dielectric layer 13.In addition, at least one of first dielectric layer 15 and second dielectric layer 13 can have the sandwich construction that comprises multilayer dielectric film.
In this manual, dielectric layer is meant in the dielectric material of this dielectric material in being contained in dielectric layer the statement that certain dielectric material comprises as principal ingredient for maximum.ZnSSiO 2Be meant ZnS and SiO 2Potpourri.
The thickness of first dielectric layer 15 and second dielectric layer 13 does not limit especially, but preferably from 3nm to 200nm.If first dielectric layer 15 or second dielectric layer 13 are thinner than 3nm, be difficult to obtain above-mentioned advantage.On the other hand, if first dielectric layer 15 or second dielectric layer 13 are thicker than 200nm, then to take a long time and form first dielectric layer 15 and second dielectric layer 13, thereby reduce the throughput rate of optical recording media 10, and, can in optical recording media 10, generate crackle owing to the stress that is present in first dielectric layer 15 and/or second dielectric layer 13.
First recording layer 31 and second recording layer 32 are suitable for record data therein.In this embodiment, first recording layer 31 is positioned at a side of light-transmitting layer 16, and second recording layer 32 is positioned at a side of substrate 11.
In this embodiment, a kind of element that first recording layer 31 will be selected from the group of being made up of Si, Ge, Sn, Mg, In, Zn, Bi and Al comprises as principal ingredient, and second recording layer 32 comprises Cu as principal ingredient.
In this way, comprise a kind of element of from the group of forming by Si, Ge, Sn, Mg, In, Zn, Bi and Al, selecting as first recording layer 31 of principal ingredient with comprise second recording layer 32 of Cu by providing, can improve the longer-term storage reliability of optical recording media 10 as principal ingredient.
In addition, these elements only apply light load to environment, and the risk of not damaging global atmosphere.
For improving the C/N ratio of reproducing signal all sidedly, a kind of element that best first recording layer 31 will be selected from the group of being made up of Ge, Si, Mg, Al and Sn comprises as principal ingredient, and preferably Si is included as principal ingredient.
When with laser beam L10 irradiation, be included in second recording layer 32 as the Cu of principal ingredient fast be included in first recording layer 31 in element mix, thereby permission with the data fast recording in first recording layer 31 and second recording layer 32.
For improving the recording sensitivity of first recording layer 31, best first recording layer 31 adds at least a element of selecting from the group of being made up of Mg, Al, Cu, Ag and Au.
Be memory reliability and the recording sensitivity that improves second recording layer 32, best second recording layer 32 adds at least a element of selecting from the group of being made up of Al, Si, Zn, Mg, Au, Sn, Ge, Ag, P, Cr, Fe and Ti.
Do not limit the gross thickness of first recording layer 31 and second recording layer 32 especially, but when the gross thickness of first recording layer 31 and second recording layer 32 became thicker, the surface smoothness of first recording layer 31 of usefulness laser beam L10 irradiation was even worse.Therefore, the noise level of reproducing signal becomes higher, and recording sensitivity reduces.On the other hand, under the too little situation of the gross thickness of first recording layer 31 and second recording layer 32, after with laser beam L10 pre-irradiation between the variation of reflection coefficient very little so that can not obtain the to have high strength reproducing signal of (C/N than).In addition, be difficult to control the thickness of first recording layer 31 and second recording layer 32.
Therefore, in this embodiment, first recording layer 31 and second recording layer 32 are formed its gross thickness from 2nm to 40nm.Be obtain the to have higher-strength reproducing signal of (C/N than) and the noise level that further reduces reproducing signal, the gross thickness of first recording layer 31 and second recording layer 32 is preferably from 2nm to 20nm, and 2nm to 10nm more preferably.
Do not limit first recording layer 31 and second recording layer 32 thickness separately especially, but for improving recording sensitivity considerably and increase variation widely with reflection coefficient between behind the laser beam L10 pre-irradiation, the thickness of first recording layer 10 preferably from the thickness of the 1nm to 30nm and second recording layer 32 preferably from 1nm to 30nm.In addition, preferably the ratio (thickness of the thickness of first recording layer 31/second recording layer 32) of the thickness of the thickness of first recording layer 31 and second recording layer 32 is defined as from 0.2 to 5.0.
The thickness that light-transmitting layer 16 is used for transmitting laser beam L10 and preferably has 10 μ m to 300 μ m.Better, light-transmitting layer 16 has the thickness of 50 μ m to 150 μ m.
Be used for forming the qualification especially of material of light-transmitting layer 16, but, preferably use ultraviolet curable resin, electron beam curing resin or the like forming under the situation of light-transmitting layer 16 by spin coating proceeding or the like.Better, light-transmitting layer 16 is formed by ultraviolet curable resin.
Can be by forming light-transmitting layer 16 on the surface that will bond to first dielectric layer 15 by the thin slice use bonding agent that the light-permeable resin is made.
Optical recording media 10 energy use-cases such as following mode with said structure are made.
At first on the surface of the substrate 11 that is formed with groove 11a and protruding 11b, form reflection horizon 12.
Can use the chemical substance that comprises the element that is used to form reflection horizon 12, form reflection horizon 12 by method of vapor-phase growing.The illustrative example of method of vapor-phase growing comprises vacuum deposition method, sputtering method or the like.
Then, on the surface in reflection horizon 12, form second dielectric layer 13.
Also can use the chemical substance that comprises the element that is used to form second dielectric layer 13, form second dielectric layer 13 by method of vapor-phase growing.The illustrative example of method of vapor-phase growing comprises vacuum deposition method, sputtering method or the like.
In addition, on second dielectric layer 13, form second recording layer 32.Also can use the chemical substance that comprises the element that is used to form second recording layer 32, form second recording layer 32 by method of vapor-phase growing.
Then, on second recording layer 32, form first recording layer 31.Also can use the chemical substance that comprises the element that is used to form first recording layer 31, form first recording layer 31 by method of vapor-phase growing.
Then, on first recording layer 31, form first dielectric layer 15.Also can use the chemical substance that comprises the element that is used for shape first dielectric layer 15, form first dielectric layer 15 by method of vapor-phase growing.
At last, on first dielectric layer 15, form light-transmitting layer 16.For example, can be by spin coating, be applied to by means of the acrylic acid ultraviolet curable resin that will adjust to proper viscosity or epoxy ultraviolet curable resin form coating on the surface of second dielectric layer 15 and with this coating of ultraviolet ray irradiation solidifying this coating, thereby form light-transmitting layer 16.
Thus, produce optical recording media 10.
For example, with following method data are recorded in the optical recording media 10 of said structure optically.
Shown in Fig. 1 and 2 (a), at first, by having the laser beam L10 of predetermined power, through light-transmitting layer 16 irradiation first recording layer 31 and second recording layers 32.
For high record density ground record data, preferably through having 0.7 or the object lens (not shown) of above numerical aperture, the laser beam L10 that will have 450nm or shorter wavelength X is incident upon on the optical recording media 10, and preferable is that λ/NA is equal to or less than 640nm.In this case, the spot diameter of the lip-deep laser beam L10 of first recording layer 31 becomes and is equal to or less than 0.65 μ m.
In this embodiment, through having the object lens of 0.85 numerical aperture NA, the laser beam L10 that will have the wavelength X of 405nm accumulates on the optical recording media 10, so that the spot diameter of the lip-deep laser beam L10 of first recording layer 31 becomes about 0.43 μ m.
Therefore, be included in first recording layer 31 as the element of principal ingredient and comprise that the element as principal ingredient is mixed with each other in second recording layer 32, and shown in Fig. 2 (b), form the record mark M that forms by the potpourri of the principal ingredient element of the principal ingredient element of first recording layer 31 and second recording layer 32.
When mixing the principal ingredient of first recording layer 31 and 32, the reflection coefficient marked change that this is regional.Because the reflection coefficient of the record mark M that forms thus is different from the reflection coefficient around the zone of the regional M that is mixed widely, so when the information of reproduction optical record, can obtain high reproducing signal (C/N compares).
When projecting laser bundle L10, make first recording layer 31 and 32 heating of second recording layer by laser beam L10.Yet in this embodiment, first dielectric layer 15 and second dielectric layer 13 are positioned at outside first recording layer 31 and second recording layer 32.Therefore, prevent effectively because the substrate 11 that heating causes and the distortion of light-transmitting layer 16.
Fig. 3 is the set of diagrams that is illustrated in first pulse string mode under the situation that adopts the 1.7RLL modulation code, the pulse string mode of wherein Fig. 3 (a) expression pulse string mode when record 2T signal, and Fig. 3 (b) expression when writing down 3T signal to the 8T signal.
First pulse string mode is the pattern that is used for the power of modulating lasering beam L10, be suitable for being necessary cooling off the situation of the rear edge part of record mark M, and particularly select at interval with in the situation of ratio (the shortest clear area interval/line writing speed) less than 40nsec of line writing speed in the shortest clear area.
Shown in Fig. 3 (a) and 3 (b), in first pulse string mode, the recording impulse that is used to form record mark M is divided into (n-1) individual sub-divided pulses, peak value place in each sub-divided pulses, the power setting of laser beam L10 is become recording power Pw, just in time in the end after sub-divided pulses, it is arranged to the second lowest power Pb2, and, it is arranged to the first lowest power Pb1 in other parts of pulse.More particularly, by will be wherein the power setting of laser beam L10 become the cooling interval T of the second lowest power Pb2 Cl (last)Insert in the basic pulse string pattern shown in Figure 11 part after last sub-divided pulses just in time, thereby constitute first pulse string mode.
Pw is arranged to high level with recording power, at this high level, be included in first recording layer 31 as the element of principal ingredient and be included in that the element as principal ingredient can be heated and mix in second recording layer 32, when the laser beam that has a recording power Pw with box lunch is incident upon on the optical recording media 10, form record mark M.On the other hand, the first lowest power Pb1 and the second lowest power Pb2 are arranged to low level, in this low level, even when the laser beam with the first lowest power Pb1 or second lowest power Pb2 is incident upon on the optical recording media 10, also basically can not hybrid packet be contained in first recording layer 31 as the element of principal ingredient and be included in second recording layer 32 element as principal ingredient.
As shown in Figure 3, the first lowest power Pb1 and the second lowest power Pb2 are specified to and make first lowest power be higher than second lowest power, thereby cool off effectively by being incident upon and be used to form record mark M on the optical recording media 10, and its power setting becomes the rear edge part of record mark M of the laser beam L10 heating of recording power Pw, and prevent with respect to the direction of motion of laser beam L10, the zone in the rear edge part downstream of record mark M is included in first recording layer 31 as the element of principal ingredient and is included in that the element as principal ingredient is mixed with each other in second recording layer 32.
Therefore, be recorded at the power that uses the first pulse string mode modulating lasering beam L10 and with data under the situation in the optical recording media 10, because the length of may command record mark M is so that it has Len req, even so by will be the shortest the clear area be arranged to less than the situation of 40nsec with the ratio (the shortest clear area interval/line writing speed) of line writing speed at interval under record data, also can reduce signal jitter and increase its C/N ratio.
Fig. 4 is the set of diagrams that is illustrated in second pulse string mode under the situation that adopts the 1.7RLL modulation code, the pulse string mode of wherein Fig. 4 (a) expression pulse string mode when record 2T signal, and Fig. 4 (b) expression when writing down 3T signal to the 8T signal.
Second pulse string mode is the situation that is suitable for being necessary cooling off the leading edge portion of record mark M, in other words, be suitable for uprising and the recording density of data uprises the heat that makes between adjacent record mark and disturbs and become big situation and use and have the situation of lower powered laser beam L10 record data owing to writing speed, and this second pulse string mode is particularly suitable for data being recorded in the situation in the optical recording media 10 with low recording sensitivity by the shortest clear area is arranged to less than 20nsec with the ratio (the shortest clear area interval/line writing speed) of line writing speed at interval.
Shown in Fig. 4 (a) and 4 (b), in second pulse string mode, the recording impulse that is used to form record mark M is divided into (n-1) individual sub-divided pulses, peak value place in each sub-divided pulses, the power setting of laser beam L10 is become recording power Pw, and just in time before first sub-divided pulses, it is arranged to the second lowest power Pb2, and, it is arranged to the first lowest power Pb1 in other parts of pulse.Especially, by will be wherein the power setting of laser beam L10 become the cooling interval T of the second lowest power Pb2 Cl (front)Insert in the basic pulse string pattern shown in Figure 11 part before first sub-divided pulses just in time, thereby constitute second pulse string mode.
At this, with definite similarly recording power Pw, the first lowest power Pb1 and the second lowest power Pb2 in first pulse string mode.
Be recorded at the power that uses the second pulse string mode modulating lasering beam L10 and with data under the situation in the optical recording media 10, because the leading edge portion of the record mark M that heats is disturbed in cooling owing to the heat between the adjacent record mark effectively, so can prevent, be included in first recording layer 31 as the element of principal ingredient and be included in that the element as principal ingredient is mixed with each other in second recording layer 32 in zone with respect to the leading edge portion upstream of the record mark M of the direction of motion of laser beam L10.
Therefore, be recorded at the power that uses the second pulse string mode modulating lasering beam L10 and with data in the situation in the optical recording media 10, because being controlled to, the length of mixed zone M has Len req, even so by will be the shortest the clear area be arranged to also can reduce the shake and the increase C/N ratio of signal under the situation of very little (for example less than 20nsec) and record data with the ratio (the shortest clear area interval/line writing speed) of line writing speed at interval.
Fig. 5 is the set of diagrams that is illustrated in the 3rd pulse string mode under the situation that adopts the 1.7RLL modulation code, the pulse string mode of the wherein pulse string mode of Fig. 5 (a) expression when record 2T signal, and Fig. 5 (b) expression when writing down 3T signal to the 8T signal.
The 3rd pulse string mode is to be suitable for being necessary to cool off the leading edge portion of record mark M and the situation of rear edge part, in other words, be suitable for uprising and data recording density uprises the heat that makes between adjacent record mark and disturbs the situation that becomes big owing to writing speed, the 3rd pulse string mode is particularly suitable for by will the shortest clear area being arranged to data are recorded in situation in the optical recording media 10 with low recording sensitivity less than 20nsec with the ratio (the shortest clear area interval/line writing speed) of line writing speed at interval.
Shown in Fig. 5 (a) and 5 (b), in the 3rd pulse string mode, the recording impulse that is used to form record mark M is divided into (n-1) individual sub-divided pulses, peak value place in each sub-divided pulses, the power setting of laser beam L10 is become recording power Pw, and just in time before first sub-divided pulses and just in time in the end after sub-divided pulses, it is arranged to the second lowest power Pb2, in other parts of pulse, it is arranged to the first lowest power Pb1.Especially, by cooling off interval T Cl (front)Insert just in time part before first sub-divided pulses in basic pulse string pattern shown in Figure 11, and will cool off interval T Cl (last)Insert the just in time part after its last sub-divided pulses, thereby constitute the 3rd pulse string mode.
At this, with definite similarly recording power Pw, the first lowest power Pb1 and the second lowest power Pb2 in first pulse string mode.
Be recorded at the power that uses the 3rd pulse string mode modulating lasering beam L10 and with data under the situation in the optical recording media 10, because cooling off effectively by its power setting becomes recording power Pw and projection to be used to form the rear edge part of record mark M of the laser beam L10 heating of record mark M, so can be, prevent to be included in first recording layer 31 as the element of principal ingredient and be included in that the element as principal ingredient is mixed with each other in second recording layer 32 in zone with respect to the rear edge part downstream of the record mark M of the direction of motion of laser beam L10.In addition, because the leading edge portion of the record mark M that heats is disturbed in cooling owing to the heat between adjacent record mark effectively, so can be, prevent to be included in first recording layer 31 as the element of principal ingredient and be included in that the element as principal ingredient is mixed with each other in second recording layer 32 in zone with respect to the leading edge portion upstream of the record mark M of the direction of motion of laser beam L10.
Therefore, be recorded at the power that uses the 3rd pulse string mode modulating lasering beam L10 and with data under the situation in the optical recording media 10, because being controlled to, the length of mixed zone M has Len req, even so by will be the shortest the clear area be arranged to also can reduce the shake and the increase C/N ratio of signal under the situation of extremely little (for example less than 20nsec) and record data with the ratio (the shortest clear area interval/line writing speed) of line writing speed at interval.
According to this embodiment, by recording impulse being divided into (n-a) individual sub-divided pulses (wherein a is 0,1 or 2, and in 8/16 modulation code, preferably a is arranged to 2, in the 1.7RLL modulation code, a is arranged to 1), and with chilling room every Tcl (last)Insert just in time in the end the part after the sub-divided pulses, or with chilling room every Tcl (front)Insert the just in time part before first sub-divided pulses, or with chilling room every Tcl (last)Insert just in time in the end after the sub-divided pulses part and with chilling room every Tcl (front)Insert the just in time part before first sub-divided pulses, be configured for the pulse string mode of the power of modulating lasering beam L10 thus.Therefore, can prevent rear edge part and/or the leading edge portion skew of record mark M effectively, even therefore the shortest clear area is being arranged under the situation of little and record data with the ratio (the shortest clear area interval/line writing speed) of line writing speed at interval, also can reduces signal jitter and increase the C/N ratio.
Fig. 6 is the block diagram of the data recording equipment of expression a preferred embodiment of the present invention.
As shown in Figure 6, data recording equipment 100 comprises Spindle Motor 52, is used to rotate optical recording media 10; 53, be used for being incident upon laser beam on the optical recording media 10 and receive light by optical recording media 10 reflections; Controller 54 is used to control the operation of Spindle Motor 52 and 53; Laser drive circuit 55 is used for laser-driven signal is carried to the end 53; And lens drive circuit 56, be used for lens drive signals is transported to shaven head 53.
As shown in Figure 6, controller 54 comprises focus servo tracking circuit 57, tracking servo circuit 58 and laser control circuit 59.
When starting focus servo tracking circuit 57, laser beam L10 is focused on first recording layer 51 of optical recording media 10 of rotation, and when startup tracking servo circuit 58, the luminous point of laser beam L10 is followed the road of optical recording media 10 automatically.
As shown in Figure 6, each of focus servo tracking circuit 57 and tracking servo circuit 58 has the automatic gain control function that is used for adjusting the automatic gain control function of focusing gain automatically and is used for adjusting automatically the tracking gain.
In addition, laser control circuit 59 is suitable for generating the laser-driven signal that will be provided by laser drive circuit 55.
In this embodiment, with be used to discern various record conditions, such as the data that are used for the required line writing speed of record data together, the data that will be used for discerning above-mentioned first pulse string mode, second pulse string mode and second pulse string mode are recorded in first recording medium 10, as the data that are used for being provided with the form of swing (wobble) or pre-pit record condition.
Therefore, laser control circuit 59 is before being recorded in data in the optical recording media 10, reading and recording being used in optical recording media 10 is provided with the data of record condition, based on the data that are used to be provided with record condition that read thus, select first pulse string mode, second pulse string mode and the 3rd pulse string mode one, so that generate laser-driven signal and make laser drive circuit 55 with its output to the end 55.
Therefore, according to required Write strategy data are recorded in the optical recording media 10.
According to this embodiment, optical recording media 10 records and is used to discern first pulse string mode, the data of second pulse string mode and the 3rd pulse string mode and be used to discern various record conditions, such as the data that are used for the required line writing speed of record data, as the data that are used to be provided with record condition, and before data being recorded in the optical recording media 10, laser control circuit 59 reading and recording being used in optical recording media 10 is provided with the data of record condition, the data that record condition was set based on being used to of reading are thus selected first pulse string mode, second pulse string mode and the 3rd pulse string mode one is used for laser beam is incident upon 53 on the optical recording media 10 so that generate laser-driven signal and control.Therefore, can be according to required Write strategy record data.
Worked example and comparative example
Hereinafter, will set forth worked example and comparative example so that further illustrate advantage of the present invention.
[making optical recording media]
Use following manner, make optical recording media with structure identical with as shown in Figure 1 optical recording media 1.
At first, placement has the polycarbonate substrate of 1.1mm thickness and 120mm diameter on sputter equipment.Then, use sputtering technology, sequentially on polycarbonate substrate, form the reflection horizon that comprises the potpourri of Ag, Pd and Cu and have 100nm thickness, comprise ZnS and SiO 2Potpourri and have 30nm thickness second dielectric layer, comprise Cu as principal ingredient and have 5nm thickness second recording layer, comprise Si as principal ingredient and have first recording layer of 5nm thickness and comprise ZnS and SiO 2Potpourri and have first dielectric layer of 25nm thickness.
Be included in ZnS and SiO in first dielectric layer and second dielectric layer 2Potpourri in ZnS and SiO 2Mol ratio be 80: 20.
In addition, use spin coating method, make first dielectric layer, so that form coating, and shine this coating, thereby the curing acrylic ultraviolet curable resin has the light-transmitting layer that thickness is 100 μ m so that form with ultraviolet ray coated with the acrylic acid ultraviolet curable resin.
Worked example 1
The optical recording media of making thus is placed in the optical recording media evaluating apparatus of being made by Pulstec Industrial Co.Ltd " DDU1000 " (ProductName).Then, the blue laser beam that will have a 405nm wavelength is with acting on the laser beam of record data, and to use its numerical aperture be 0.85 object lens, through light-transmitting layer, laser beam is focused on the optical recording media, and under following tracer signal condition in record data wherein.
Modulation code: (1.7) RLL
Channel bit length: 0.12 μ m
Line writing speed: 5.3m/sec
Channel clock: 66MHz
Tracer signal: random signal, the 2T signal that comprises no particular order is to the 8T signal
By comprising that (n-1) individual sub-divided pulses comes the power of modulating lasering beam as first pulse string mode of recording impulse, wherein n is 2 to 8 integer, the cooling interval T Cl (last)The length stuck-at-T and the second lowest power Pb2 be fixed on 0.1mW, and the first lowest power Pb2 changes between 0.5mW, 1.0mW, 1.5mW and 2.0mnW, and changes recording power Pw.
When format efficiency (format efficiency) is 80% and the shortest clear area when at interval being 30.4nsec with the ratio (the shortest clear area interval/line writing speed) of line writing speed, data transmission rate is about 35Mpbs.
Worked example 2
Except that using first pulse string mode record 2T signal and using basic pulse string pattern record 3T signal each to the 8T signal, similarly data are recorded in the optical recording media with worked example 1.
Worked example 3
Except that the power that uses the second pulse string mode modulating lasering beam, data are recorded in the optical recording media with the mode of worked example 1.
The cooling interval T Cl (last)Length be arranged to 1T.
Worked example 4
Except that using second pulse string mode record 2T signal and use in basic pulse string pattern record 3T to the 8T signal each, data are recorded in the optical recording media with the mode of worked example 1.
The cooling interval T Cl (last)Length be arranged to 1T.
Worked example 5
Except that the power that uses the 3rd pulse string mode modulating lasering beam, data are recorded in the optical recording media with the mode of worked example 1.
The cooling interval T Cl (last)With the cooling interval T Cl (front)Length be arranged to 1T respectively.
Worked example 6
Except that using the 3rd pulse string mode record 2T signal and use basic pulse string pattern record 3T signal each to the 8T signal, data are recorded in the optical recording media with the mode of worked example 1.
The cooling interval T Cl (last)With the cooling interval T Cl (front)Length be arranged to 1T respectively.
Comparative example
Except that the power that uses basic pulse string pattern modulating lasering beam, data are recorded in the optical recording media with the mode of worked example 1.
Then, use above-mentioned optical recording media evaluating apparatus, the data that write down in the playback light recording medium, and the C/N ratio of measuring the 2T signal that uses laser beam record with optimal recording power Pw.When reproducing data, adopting the laser beam of the wavelength with 405nm and numerical aperture (NA) is 0.85 object lens.
At this, recording power Pw hour is defined as optimal recording power Pw with shake.
Measurement result as shown in Figure 7.
As shown in Figure 7, in worked example 1,2,5 and 6, respectively comprise the cooling interval T by using Cl (last)The power of pulse string mode modulating lasering beam and record data even find when increase by the first lowest power Pb1, also are difficult to reduce the C/N ratio of 2T signal.
Therefore, find under situation, if use comprises the cooling interval T with the message transmission rate record data of about 35Mbps Cl (last)The power of pulse string mode modulating lasering beam, by the first lowest power Pb1 being arranged to high value, can be to hang down recording power Pw record data.
On the contrary, in worked example 3, do not comprise the cooling interval T by using Cl (last)The power of pulse string mode modulating lasering beam and record data find that when the first lowest power Pb1 is provided with De Taigao, the C/N of 2T signal ratio becomes even worse, and in worked example 4, find generally speaking that the C/N of 2T signal is than being low.Can infer reasonably that this is because be in the situation of 30.4nsec with the ratio of line writing speed at interval in the shortest clear area, the leading edge portion of record mark since the heat between adjacent record mark disturb and in the direction opposite, be offset with the direction of motion of laser beam.
On the other hand, as shown in Figure 7, come in the comparative example of record data by the power that uses basic pulse string pattern modulating lasering beam therein, find along with the first lowest power Pb1 increases, the C/N of 2T signal than significantly even worse.
Remove the line writing speed is arranged to 10.6m/sec, the channel clock frequency configuration becomes the 133MHz and the first lowest power Pb1 outside changing between 0.5mW, 1.0mW, 1.5mW and the 2.0mW, similar to the above, the 2T signal that comprises no particular order to the random signal of 8T signal is recorded in the optical recording media.The C/N ratio that reproduces the data that are recorded in thus in the optical recording media and measure the 2T signal that uses laser beam record with optimal recording power Pw.
At this, when format efficiency is 80% and the shortest clear area when at interval being 15.2nsec with the ratio (the shortest clear area interval/line writing speed) of line writing speed, data transmission rate is about 70Mbps.
Measurement result as shown in Figure 8.
As shown in Figure 8, find that in each case when the first lowest power Pb1 increased, the C/N ratio of 2T signal became even worse.Yet, find respectively comprising the cooling interval T by using Cl (last)The power of pulse string mode modulating lasering beam and the worked example 1 and 2 of record data, respectively comprise the cooling interval T by using Cl (front)The power of pulse string mode modulating lasering beam and the worked example 3 of record data and 4 and respectively comprise the cooling interval T by using Cl (front)With the cooling interval T Cl (last)The power of pulse string mode modulating lasering beam and in each of the worked example 5 of record data and 6, the C/N of 2T signal than the C/N that wants 2T signal in the comparative example than better.
Therefore, find that when being easy to act as record data most, use comprises the cooling interval T under the situation with the data transmission rate record data of about 70Mbps Cl (last)Pulse string mode, comprise the cooling interval T Cl (front)Pulse string mode, or comprise the cooling interval T Cl (last)With the cooling interval T Cl (front)Pulse string mode come the power of modulating lasering beam.
Especially, in the worked example 1 of using the first pulse string mode record data, use the worked example 3 of the second pulse string mode record data, use the worked example 5 of the 3rd pulse string mode record data, and by using the 3rd pulse string mode record 2T signal and using basic pulse string pattern record 3T signal mode of each to the 8T signal to come in each of worked example 6 of record data, even find the first lowest power Pb1 is increased under the situation of 2mW, thereby the C/N of 2T signal is than being substantially equal to or being higher than the C/N ratio that the basic pulse pattern of wherein using the first lowest power Pb1 to be arranged to 0.5mW is come the 2T signal in the comparative example of power record data of modulating lasering beam, and and under the situation of record data at the power of a modulating lasering beam by using these pulse string modes, can be by the first lowest power Pb1 being arranged to high value, with low recording power Pw record data.
In addition, remove the line writing speed is arranged to 10.6m/sec, channel clock is arranged to outside 133MHz and the first lowest power Pb1 change between 0.5mW, 1.0mW, 1.5mW, 2.0mW and 2.5mW, similar to the above, the 2T signal that comprises no particular order to the random signal of 8T signal is recorded in the optical recording media.Then, reproduce the data that are recorded in thus in the optical recording media so that measure the C/N ratio of reproducing signal, and the relation between the best power Pw of Laser Measurement bundle and the first lowest power Pb1.
Measurement result as shown in Figure 9.
As shown in Figure 9, find that in each case if the first lowest power Pb1 is provided with higherly, the optimal recording power Pw of laser beam reduces, and can use the laser beam with low recording power Pw to come record data.
Yet, find in each case, be arranged to be equal to or higher than under the situation of 2.5mW at the first lowest power Pb1, make and be included in first recording layer as the element of principal ingredient and be included in that the element as principal ingredient is mixed with each other in second recording layer, even so that also can form record mark M at the place, clear area, and the C/N ratio becomes quite poor.
With reference to certain embodiments and worked example, illustrate and described the present invention.Yet, it should be noted that the present invention never is limited to the details of described configuration and under the situation of the scope that does not deviate from attached claims, can makes various modifications and improvement.
For example, in the foregoing description and worked example, although forming, first recording layer 31 and second recording layer 32 contact with each other, but not definitely to be necessary to form first recording layer 31 and second recording layer 32 with contacting with each other, but as long as second recording layer 32 is positioned near first recording layer 31, with laser beam irradiation when zone, then foot is also can to form the mixed zone of principal ingredient of the principal ingredient that comprises first recording layer 31 and second recording layer 32 with box lunch.In addition, can insert one or more other layers at first recording layer 31 and 32 of second recording layers, such as dielectric layer.
In addition, in the above-described embodiments, although first recording layer 31 comprises from by Si, Ge, Sn, Mg, In, Zn, a kind of element of selecting in the group that Bi and Al form comprises Cu as principal ingredient as the principal ingredient and second recording layer 32, but concerning first recording layer 31, comprise from by Si, Ge, Sn, Mg, In, Zn, a kind of element of selecting in the group that Bi and Al form is as principal ingredient and concerning second recording layer 32, comprising Cu is not indispensable as principal ingredient, and first recording layer 31 can comprise from by Si, Ge, C, Sn, a kind of element of selecting in the group that Zn and Cu form can comprise Al as principal ingredient as the principal ingredient and second recording layer 32.In addition, first recording layer 31 can comprise a kind of element of selecting and can comprise Zn as principal ingredient as the principal ingredient and second recording layer 32 from the group of being made up of Si, Ge, C and Al.In addition, concerning first recording layer 31 and second recording layer 32, comprise the element that differs from one another and comprise a kind of element of from the group of forming by Al, Si, Ge, C, Sn, Au, Zn, Cu, B, Mg, Ti, Mn, Fe, Ga, Zr, Ag and Pt, selecting then sufficient also as principal ingredient.
In addition, in the foregoing description and worked example, although optical recording media 10 comprises first recording layer 31 and second recording layer 32, but except that first recording layer 31 and second recording layer 32, optical recording media 10 can comprise and comprises a kind of element of selecting as one or more recording layers of principal ingredient or comprise the one or more recording layers of Al as principal ingredient from the group of being made up of Si, Ge, Sn, Mg, In, Zn, Bi and Al.
In addition, although in the foregoing description and worked example, first recording layer 31 is positioned at light-transmitting layer 16 1 sides and second recording layer 32 is positioned at substrate 11 1 sides, but also can make first recording layer 31 be positioned at substrate 11 1 sides and second recording layer 32 is positioned at light-transmitting layer 16 1 sides.
In addition, in the foregoing description and worked example, optical recording media 10 comprises first dielectric layer 15 and second dielectric layer 13, and first recording layer 31 and second recording layer 32 are between first dielectric layer 15 and second dielectric layer 13.Yet, concerning optical recording media 10, comprise that first dielectric layer 15 and second dielectric layer 13 are not indispensable, that is, optical recording media 10 can not comprise dielectric layer.In addition, optical recording media 10 can comprise single dielectric layer, and in this case, dielectric layer can be positioned at substrate 11 1 sides or light-transmitting layer 16 1 sides with respect to first recording layer 31 and second recording layer 32.
In addition, in worked example, although in the foregoing description and worked example, first recording layer forms with second recording layer has identical thickness, and it is not indispensable first recording layer and second recording layer are formed having identical thickness.
In addition, in the foregoing description and worked example, although optical recording media 10 has reflection horizon 12, if but by make be included in first recording layer as the element of principal ingredient be included in second recording layer in the catoptrical level that mixes among the record mark M that forms as the Zn of principal ingredient significantly different each other with the catoptrical level in the zone of projecting laser bundle not, then can omit the reflection horizon.
In addition, in the above-described embodiments, although come the power of modulating lasering beam according to first pulse string mode, second pulse string mode and the 3rd pulse string mode, thereby form all record mark M, but only under the short situation of the length of record mark M, when reducing the recording power Pw of laser beam the width of record mark M attenuate and the C/N that reduces signal significantly than (carrier wave/noise ratio) be longer than Len req so that prevent that the leading edge portion of record mark M and/or rear edge part skew and record mark M from becoming.Therefore, only writing down the 2T signal so that form under the situation of short record mark M, just can come the power of modulating lasering beam according to first pulse string mode, second pulse string mode or the 3rd pulse string mode, and record 3T signal to the 8T signal so that form under the situation of record mark M, come the power of modulating lasering beam according to the basic pulse string pattern.
In addition, in the embodiment shown in fig. 6, although with the swing or the form of pre-pit, the data that will be used for being provided with record condition are recorded in optical recording media 10, and the data that are used for being provided with record condition can be recorded in first recording layer 31 or second recording layer 32.
In addition, in the embodiment shown in fig. 6, although focus servo tracking circuit 57, tracking servo circuit 58 and laser control circuit 59 all are integrated in the controller 54, but it is not indispensable in the controller 54 that focus servo tracking circuit 57, tracking servo circuit 58 and laser control circuit 59 are integrated into, and can provide focus servo tracking circuit 57, tracking servo circuit 58 and laser control circuit 59 dividually with controller 54.The software of the function that is used to realize focus servo tracking circuit 57, tracking servo circuit 58 and laser control circuit 59 also can be installed in controller 54 in addition.
In addition, in the foregoing description and worked example, although described about data being recorded in the situation in next die optical recording media 10, wherein, the rear edge part of record mark M and leading edge portion are owing to adopting the quite high laser beam of its per unit area energy to tend to skew, but the invention is not restricted to the application in the situation in data being recorded in next die optical recording media, the present invention can be widely used in data are recorded in situation in the write once optical recording medium except that next die optical recording media.
According to the present invention, can be provided for data are recorded in method in the optical recording media, It can form the record mark with Len req and width in write once optical recording medium Note.
In addition, according to the present invention, can be provided for data are recorded in the optical recording media Method, though the method in interval, the shortest clear area and the little situation of the ratio of line writing speed, Also can in write once optical recording medium, form the record mark with Len req and width Note.
In addition, according to the present invention, can be provided for data are recorded in the optical recording media Method, the method can use its recording power to be arranged to low laser beam, at write-once type light Form the record mark with Len req and width in the recording medium.
In addition, according to the present invention, can be provided for data are recorded in the optical recording media Method, the method can be in comprising the write once optical recording medium of two or more recording layers, Formation has the record mark of Len req and width.
In addition, according to the present invention, can be provided for data are recorded in the optical recording media Device, it can form the note with Len req and width in write once optical recording medium Record mark.
In addition, according to the present invention, can be provided for data are recorded in the optical recording media Device is even it also can in interval, the shortest clear area and the little situation of the ratio of line writing speed In write once optical recording medium, form the record mark with Len req and width.
In addition, according to the present invention, can be provided for data are recorded in the optical recording media Device, it can use recording power to be arranged to low laser beam, at the write-once type optical recording medium Form the record mark with Len req and width in the matter.
In addition, according to the present invention, can be provided for data are recorded in the optical recording media Device, it can be in comprising the write once optical recording medium of two or more recording layers, shape Become to have the record mark of Len req and width.
In addition, according to the present invention, can provide write once optical recording medium, wherein can shape Become to have the record mark of Len req and width.
In addition, according to the present invention, can provide write once optical recording medium, wherein, namely Make in interval, the shortest clear area and the little situation of the ratio of line writing speed, also can form and have institute Need the record mark of length and width.
In addition, according to the present invention, can provide write once optical recording medium, wherein, energy Use its recording power to be arranged to low laser beam, in write once optical recording medium, form Record mark with Len req and width.
In addition, according to the present invention, can provide write once optical recording medium, wherein, energy In comprising the write once optical recording medium of two or more recording layers, form and have required length The record mark of degree and width.

Claims (16)

1. method that is used for data are recorded in optical recording media, wherein, in the write once optical recording medium of at least one recording layer that comprises substrate and on described substrate, form, by being incident upon on described at least one recording layer according to the laser beam that pulse string mode is modulated its power, and at least two record marks of formation are come record data in this at least one recording layer, described pulse string mode comprises that at least its level is arranged to be arranged to pulse corresponding to the level of first lowest power corresponding to the pulse of the level of recording power and its level, is used for this method that data are recorded in optical recording media is comprised by being arranged at its level corresponding to comprising further one of at least in the front-end and back-end of the pulse of the level of described recording power that its level is arranged to the step of modulating the power of described laser beam corresponding to the pulse string mode of the pulse of the level of second lowest power that is lower than described first lowest power.
2. the method that is used for data are recorded in optical recording media as claimed in claim 1, wherein, this optical recording media further comprises light-transmitting layer and first recording layer that forms and second recording layer between described substrate and described light-transmitting layer, and, thereby this optical recording media constitutes by laser beam being projected make on it to be included in described first recording layer as the element of principal ingredient and to be included in described second recording layer element as principal ingredient and mixes and form described at least two record marks.
3. the method that is used for data are recorded in optical recording media as claimed in claim 2, wherein, described second recording layer forms with described first recording layer and contacts.
4. as any one described method that is used for data are recorded in optical recording media of claim 1 to 3, wherein,, form described at least two record marks by 40nsec is arranged to be equal to or less than with the ratio of line writing speed at interval in the shortest clear area.
5. the method that is used for data are recorded in optical recording media as claimed in claim 4 wherein, by 20nsec is arranged to be equal to or less than with the ratio of line writing speed at interval in the shortest described clear area, forms described at least two record marks.
6. as any one described method that is used for data are recorded in optical recording media of claim 1 to 5, wherein, constitute its level by sub-divided pulses and be arranged to pulse corresponding to the level of described recording level corresponding to the quantity of the length of described record mark.
7. the method that is used for data are recorded in optical recording media as claimed in claim 6 wherein, becomes first lowest power between the adjacent sub-divided pulses with the power setting of described laser beam.
8. as any one described method that is used for data are recorded in optical recording media of claim 1 to 7, wherein, have the laser beam that equals or be shorter than the wavelength of 450nm by projection on described optical recording media and come record data therein.
9. as any one described method that is used for data are recorded in optical recording media of claim 1 to 8, wherein, by adopting numerical aperture NA and wavelength X to satisfy the object lens of λ/NA≤640nm and laser beam and described laser beam is incident upon on the described optical recording media, thereby data are recorded in the described optical recording media through described object lens.
10. device that is used at the optical recording media record data, comprise the laser beam grenade instrumentation, be used for to be incident upon the write once optical recording medium of at least one recording layer that comprises substrate and on described substrate, form according to the laser beam that pulse string mode is modulated its power, described pulse string mode comprises that at least its level is arranged to be arranged to pulse corresponding to the level of first lowest power corresponding to the pulse of the level of recording power and its level, and described laser beam grenade instrumentation is configured to by being arranged at its level corresponding to comprising further one of at least in the front-end and back-end of the pulse of the level of recording power that its level is arranged to modulate the power of described laser beam corresponding to the pulse string mode of the pulse of the level of second lowest power that is lower than described first lowest power.
11. the device that is used for data are recorded in optical recording media as claimed in claim 10 wherein, by 40nsec is arranged to be equal to or less than with the ratio of line writing speed at interval in the shortest clear area, forms described at least two record marks.
12. the device that is used for data are recorded in optical recording media as claimed in claim 11 wherein, by 20nsec is arranged to be equal to or less than with the ratio of line writing speed at interval in the shortest described clear area, forms described at least two record marks.
13. write once optical recording medium, comprise substrate and at least one recording layer that on described substrate, forms, this optical recording media be configured to by will modulating its power according to pulse string mode laser beam projection thereon, and at least two record marks of formation are come record data therein in described at least one recording layer, described pulse string mode comprises that at least its level is arranged to be arranged to pulse corresponding to the level of first lowest power corresponding to the pulse of the level of recording power and its level, described optical recording medium is useful on the data that record condition is set, and this record condition is to be used for according to being arranged at its level corresponding to comprising further one of at least in the front-end and back-end of the pulse of the level of recording power that its level is arranged to come the power of modulating lasering beam needed corresponding to the pulse string mode of the pulse of the level of second lowest power that is lower than described first lowest power.
14. write once optical recording medium as claimed in claim 13, further comprise light-transmitting layer and first recording layer that between described substrate and described light-transmitting layer, forms and second recording layer, thereby this optical recording media constitutes by laser beam being projected make on it and is included in described first recording layer as the element of principal ingredient and is included in that the element as principal ingredient mixes in described second recording layer, thereby forms described at least two record marks.
15. write once optical recording medium as claimed in claim 14, wherein, described second recording layer forms with described first recording layer and contacts.
16. as claim 14 or 15 described write once optical recording medium, wherein, described light-transmitting layer forms the thickness with 10nm to 300nm.
CN038141574A 2002-05-17 2003-05-19 Method and device for recording data on optical recording medium, and optical recording medium Pending CN1662966A (en)

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